<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
      .one{
          text-align: center;
          /* text-align: center; */
          text-indent: 2em;
          width: 100px;
          height: 20px;
          line-height: 26;
      }  
    </style>
</head>
<body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <p></p>
    <p></p>
    <p></p>
    <p></p>
    <ul>
        <li></li>
    </ul>
    <div><span></span></div>
    <div></div>
    <p></p>
    <div></div>
    <span></span>
    <div class="nav"></div>
    <p class="one"></p>
    <span class="one"></span>
    <ul id="nihao"></ul>
    <!-- .demo$*5 -->
   <div class="demo1"></div>
   <div class="demo2"></div>
   <div class="demo3"></div>
   <div class="demo4"></div>
   <div class="demo5"></div>
  <!-- 我们想生成的标签里面默认显示几个文字div{文字} -->
  <div>来到北京的第二天</div>
  <div>来到北京的第二天</div>
  <div>来到北京的第二天</div>
  <div>来到北京的第二天</div>
  <div>来到北京的第二天</div>
  <!-- div{$}*4 -->
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
</body>
</html>